BARTKUS, Ignas; PLIKUSAS, Aleksandras. The generalization of ratio-cum product estimator for the arbitrary sample design. Lietuvos matematikos rinkinys, [S. l.], v. 50, n. proc. LMS, p. 275–280, 2009. DOI: 10.15388/LMR.2009.49. Disponível em: https://www.journals.vu.lt/LMR/article/view/17977.. Acesso em: 4 may. 2024.